Year	Number
2004-01-01	184
2005-01-01	177
2006-01-01	181
2007-01-01	180
2008-01-01	183
2009-01-01	193
2010-01-01	187
2011-01-01	177
2012-01-01	257
2013-01-01	232
2014-01-01	237
2015-01-01	240
2016-01-01	239
2017-01-01	265